Arkansas vs South Carolina Earthquake Risk

Arkansas and South Carolina share the same risk score of 5/10 (Moderate). Both states face similar levels of seismic hazard, though the specific fault systems and earthquake characteristics differ.

Arkansas averages approximately 40 earthquakes per year, while South Carolina averages about 15 per year. Arkansas experiences roughly 25 more earthquakes annually.

Arkansas is associated with New Madrid Seismic Zone (NE corner). South Carolina is associated with Middleton Place-Summerville Seismic Zone. These fault systems determine the type and frequency of seismic activity each state experiences.

In Arkansas, approximately 20% of the population lives in areas at risk from earthquakes, compared to 20% in South Carolina. South Carolina has a larger percentage of residents exposed to seismic hazard.

Arkansas's most notable earthquake: 1811 New Madrid (epicenter nearby). South Carolina's most notable earthquake: 1886 Charleston (M7.3). These historical events illustrate the seismic potential of each state.